UNITED STATES DEPARTMENT OF THE INTERIOR
GEOLOGICAL SURVEY
COAL GEOLOGY OF THE BOWMAN-GASCOYNE AREA,
ADAMS, BILLINGS, BOWMAN, GOLDEN VALLEY, AND SLOPE COUNTIES,
NORTH DAKOTA
By
Robert C. Lewis
Open-File Report 79-1698
1979
This report has not been edited for conformity with U.S. Geological Survey editorial standards
or stratigraphic nomenclature.
CONTENTS
Page
A 1- o i- v~ o r> t- _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ . _ .__ _ _ _ _ . _ ._ _ ._ _ _ _ _ _ 1/iDo L I. clL l_ x
JLn t rod Lie t ion 1
LiOcat ion ~ ~~ _____ j^
L ur p o se ' _- ___ _ ._ _ _ . __ . _ _ j_
Previous investigations 3
Present investigations 3
Development and access 4
« --« __ _-«-« _». _ _-«-«__---___ -in _________.-»..____________ -in «. __..»__..»_ - -.__, -.__, -__.__,__.__,__ /I . . t+
ILLUSTRATIONS [Plates in pocket]
Plate 1. Structure-contour map drawn on base of Harmon bed or second Harmon split
2-8. Isopach maps:
2. Hansen bed, first and second Hansen splits
3. Harmon bed, first and second Harmon splits;overburden on Harmon bed or first Harmon split
3a. Harmon bed, first and second Harmon splits and overburden on Harmon bed (Gascoyne area)
3b. Harmon bed, first and second Harmon splits and overburden on Harmon bed (Amidon area)
4. Local bed
5. Garner Creek bed
6. Meyer bed
7. HT Butte bed
8. Fryburg bed; location map of correlation diagrams A- A' , B-B' , C-C' , and D-D'
9. Correlation diagrams A-A T , B-B T , C-C', and D-D'
Figure 1. Index map showing location of Bowman-Gas coyne area 2
Table 1.
TABLES
Analyses of coal samples, as-received, from the Bowman-Gascoyne area
2. Drill-hole data for the Bowman-Gascoyne area-
Page
10
Conversion Table
To convert English units
Multiply byTo obtain metric units
Feet
Miles
Feet/mile
Tons (short)
0.3048
2.589
.1894
.9072
meters
2 kilometers
meters/kilometer
metric ton
xi
COAL GEOLOGY OF THE BOWMAN-GASCOYNE AREA,
ADAMS, BILLINGS, BOWMAN, GOLDEN VALLEY, AND SLOPE COUNTIES,
NORTH DAKOTA
By Robert C. Lewis
ABSTRACT
The Bowman-Gascoyne area is located in southwestern North Dakota.
It is situated on the southwestern edge of the Williston structural
basin and the northeastern flank of the Cedar Creek anticline. Strata
of the Fort Union Formation (Paleocene), consisting of nonmarine clay-
stone, sandstone, and lignite, dip to the northeast 25-50 ft/mi.
Seven correlatable coal beds of varying thicknesses and areal
dimensions occur in the area. The thickest and most persistent of
these beds is the Harmon bed which attains a maximum thickness of
38 ft in T. 134 N., Rs. 101 and 102 W. Analyses show a heating value
of 5,915-6,680 Btu/lb and a sulfur content of 0.6-1.4 percent.
Two areas of high-coal-development potential are located near
Gascoyrie and Amidon. The Harmon bed in these two areas contains a
total of 740,000,000 and 650,000,000 tons, respectively, and is under
less than 150 ft of overburden.
INTRODUCTION
Location
The Bowman-Gascoyne area includes parts of Adams, Billings,
Bowman, Golden Valley, and Slope Counties (fig. 1). The study area2
covers approximately 1,990 mi .
Purpose
The purpose of this report is to evaluate data from several coal
beds in the Bowman-Gascoyne area and to update a previously published
report of the area (Lewis, 1977). It is one of a series of U.S. Geological
Survey reports assessing coal deposits in North Dakota and eastern
Montana.
NORTH DAKOTA
R. 105 W. RJ04W. RI03W. RJO2W. RIOIW. R.IOOW.
<!Q 2--
Otj±. SlS
O z.
v)1' k
BILLJNGS CO
SLOPE CO
T. 138 N.
T. 137 N.
R99W. R.98W.
SLOPE CO
SCALE IU.000,000
BOWM IN CO
0
j0
CO*
as|<
t
T. 136 N.
T. 135 N.
T. 134 N.
T. 133 N.
T. 132 N.
T. 131 N.
T. !30 N,
Figure I. Index mop showing location of Bowman Gascoyne area; Adams, Billings,
Bowman, Golden \falley, and Slope Counties, North Dakota
Previous Investigations
The lignite deposits of southwestern North Dakota were origi
nally .described by Barton (1896, p. 603-694). Leonard, Babcock,
and Dove (1925, p. 31-77) listed several measured rock-coal intervals
from various coal beds in this area. The first detailed map showing
the outcrops, area dimensions, and thicknesses of several Fort Union
coal beds was published by Hares (1928, pis. 8-14). Kepferle and
Culbertson (1955, pis. 14-20) used surface and subsurface data to
determine the coal thickness, areal extent, and reserves of the
Harmon bed from Gascoyne to north of Bowman. Lewis (1977) used
previously reported coal data and lithologic and geophysical logs
to evaluate the Hansen and Harmon coal beds in the southern part of
the Bowman-Gascoyne area.
Present Investigations
The principal sources of data for this report were surface
mapping by the author, geophysical logs from drilling by the North
Dakota Geological Survey in cooperation with the U.S. Geological
Survey (U.S. Geological Survey and North Dakota Geological Survey,
1976, 1978), oil-well geophysical logs, lithologic water-well logs
from the North Dakota State Water Commission (Croft, 1974), and
rock-coal thicknesses from Kepferle and Culbertson (1955), which
could be verified by geophysical or lithologic logs.
Coal-thickness data and outcrop locations from Leonard, Babcock,
and Dove (1925) and Hares (1928) were not incorporated in this report
because positive correlation of coal data could not be made with
recently acquired surface and subsurface data.
Geography
The dominant topographic features of this unglaciated, semi-
arid region are a zone of badlands along the Little Missouri River
and its tributaries, low-lying grass-covered plains and hills, and
large isolated buttes that rise several hundred feet above the
general land surface. Total relief in the area is approximately
1,200 ft.
Development and access
Many small excavation sites are. located throughout the area.
These are very small abandoned mines which supplied coal to area
residents.
The Gascoyne mine (pis. 1, 3, and 3a) is the only strip mine in
the study area. It is operated by the Knife River Coal Company which
has mined approximately 17,530,000 tons of coal from this area since
1956. Most of this coal has been used in power plants in South Dakota
and Minnesota.
U.S. Highways 12 and 85, North Dakota State Highways 21 and 67,
and the Chicago, Milwaukee, St. Paul, and Pacific Railroad are the
primary transportation routes through the area (pi. 1).
STRATIGRAPHY
Rocks belonging to the Fort Union Formation (Paleocene) and
White River Group (Oligocene) crop out within the study area (Hares,
1928, pi. 14). The Fort Union Formation consists of the following
members: Ludlow, Tongue River, and Sentinel Butte. The White River
Group includes the Chadron and Brule Formations (Moore and others,
1956).
The Fort Union Formation consists of 650-850 ft of nonmarine,
cyclic rock units composed of gray claystone and siltstone, lignite,
and cross-bedded sandstone deposited in a fluvial, delta plain en
vironment (Jacob, 1973, p. 1038).
The nonmarine White River Group is about 300 ft thick and
consists of white calcareous claystone, locally conglomeratic sand
stone, bentonitic claystone, and isolated lenses of freshwater lime
stone (Kepferle and Culbertson, 1955, p. 136).
STRUCTURE
The Bowman-Gascoyne area is located on the southwestern edge
of the Williston structural basin and the northeastern flank of the
Cedar Creek anticline. A structure-contour map drawn on the base of
the Harmon bed (pi. 1) shows the underlying strata trending approx
imately N. 30° W. , and dipping to the northeast 25-50 ft/mi. Except
for local anomalies, the Harmon structural trend is approximately
parallel to the Cedar Creek anticline (Hares, 1928, p. 45).
4
The structure-contour map of the Harmon bed (pi. 1) is the
only structure map included in this report, although preliminary
structure-contour maps were drawn for each coal bed in the study
area. Except for small localized anomalies, the structural ori
entation of the other coal beds is very similar to and consistent
with the Harmon bed.
The author mapped a normal fault located in the northeastern
part of T. 134 N., R. 102 W., (pis. 1, 2, 3, and 3b). This fault
disrupts the Harmon outcrop with an estimated displacement of 60 ft
and is downthrown to the east.
COAL
Outcrop and subsurface data show seven principal Fort Union
coal beds in the Bowman-Gascoyne area (pi. 9). Several stratigraph-
ically lower coal beds are known to exist but incomplete data preclude
any definitive evaluation. Subsurface chemical- and physical-coal
data are presented in tables 1 and 2, respectively.
Hansen bed. The Hansen bed (pis. 2 and 9) is stratigraphically
the lowest coal bed discussed in this report (pi. 9). It lies 45-
90 ft above the base of the Tongue River (Kepferle and Culbertson,
1955, p. 143) and crops out along the valley bottoms of Deep and Sand
Creeks and the Little Missouri River. The Hansen bed averages about
4 ft in thickness but, locally, pods of coal occur which attain
thicknesses of 8-15 ft.
Harmon bed. The Harmon bed (pis. 1, 3, 3a, 3b, and 9) is the
thickest, most continuous coal bed in the area. It lies 8-106 ft
above the Hansen bed and crops out along Buffalo, Deep, and Sand
Creeks and the Little Missouri River. Southwest of Amidon the bed
attains a maximum thickness of 38 ft. Minimum measured thickness of
the Harmon bed is 1 ft.
Two areas of high-development potential are located near Gascoyne
(pi. 3a) and Amidon (pi. 3b). Maps of these two areas have been en
larged to provide greater detail about the coal thickness, outcrop
location, and 150-ft overburden limits of the Harmon bed.
Table
1. Analyses of coal samples, as received,
from the
Bowman-Gascoyne ar
ea
_____Proximate (p
erce
nt)
,,
. Volatile
Fixed
Moisture
_________matter
carbon
24.5
Ultimate
Heating
^percent)
value
_
Sulfur
Btu/lb
7.1
0.
Locati
on
Bed
w-l
-uta
. U
C^
\ p
el.
\_-C
lt 1
_ J
w
-L.
i_ a
-mci
l_ >
_ n
Cd
l_-L
Hj
Volatile
Fixed
(per
cent
) value
Sour
cem
at-1
-<=
>-r
r-A
vK
rm
S
tl]
fli
r
Rl-
ii/I
H
T.13
1 N.,R.99 W.,
Gascoyne Mine
T.13
1 N.,R.100 W.,
sec. 24
T.13
1 N.,R.100 W.,
sec.
25
T.132 N.,R.102 W.,
sec. 14
T.132 N.,R.102 W.,
sec.
15
1,132 N.,R.102 W.,
sec.
15
T.133 N.,R.101 W.,
sec.
1
T.135
N.,R.101 W.,
sec.
31
T.138 N.,R.100 W.,
sec.
5
Harmon
Harmon
Harmon
Harmon
Hansen
J
Harmon
43.1
41.2
39.2
Harmon
43,0
Harmon
41,1
44.5
42.5
25.3
6,110
Kepferle and
Culbertson
/ i
r\ r c
_ i ^ n \
24.8
26.9
7.1
1.4
6,51
0
24.2
28.7
7.9
1.2
6,620
27,3
25.3
4.4
.6
5,91
5
25.6
27.5
5..7
6,680
(1955, p.
139)
Do.
Do.
Do.
Do.
24.8
25.5
5.2
.7
6,062
Bran
t (1953, p.
5)
27,2
24.0
6.3
1.4
5,952
Do.
26.1
26.3
3.8
.6
5,970
Magnusson (1960)
Fryburg
40.3
25
.2
26.4
7.
6 .5
5,97
5Do.
bed
correlations indicate this to
be the
Harmon bed.
Identified resources of the Harmon bed under less than 150 ft
of overburden in the Gascoyne and Amidon areas are 740,000,000 tons
and 650,000,000 tons, respectively.
As-received analyses show the heating value of the coal in the
Harmon bed is 5,915-6,680 Btu/lb and it contains 0.6-1.4 percent
sulfur (table 1).
Local bed. A local bed (pis. 4 and 9) lies 19-166 ft above the
Harmon bed. Hares (1928, p. 61) mapped this unnamed coal bed only in
T. 138 N., R. 102 W., but subsequent drilling shows it to be more wide
spread but quite erratic in its occurrence. Coal-thickness measurements
range from 1 to 12 ft.
Garner Creek bed. The Garner Creek bed (pis. 5 and 9) lies 18-138
ft above the local bed. This bed crops out in the central and northern
plateau areas and occurs in most areas as a single bed but locally sep
arates into multiple splits. Total coal thickness ranges from 2 to 18 ft.
M.^Z£J__^l4.« The Meyer bed (pis. 6 and 9) lies 20-225 ft above the
Garner Creek bed. Except for a narrow elongate parting, the bed occurs
as a single seam with a maximum thickness of 15.5 ft. In drill holes
20, 30, 32, and 108, the thickness of the Meyer bed closely approximates
that of the lower split in drill-holes 8, 33, 109, and 110. An alterna
tive interpretation to the one presented (pi. 6) is that the upper split
has pinched out rather than merged with the lower split to form a single
coal bed.
HT Butte bed. The HT Butte bed (pis. 7 and 9) lies 25-108 ft above
the Meyer bed and marks the stratigraphic boundary between the Tongue
River and Sentinel Butte Members (Royse, 1967). Except for local isolated
splits separated by claystone partings, the bed occurs as a single seam
and has a maximum thickness of 11 ft.
Fryburg bed. The Fryburg bed (pis. 8 and 9) lies 33-136 ft above
the HT Butte bed and is stratigraphically the highest coal bed to crop
out in the study area. Restricted to a small area in the northeast, the
bed reaches a maximum thickness of 12 ft in T. 138 N., R. 100 W.
As-received analysis shows the heating value of the coal in the
Fryburg bed to be 5,975 Btu/lb and the sulfur content is 0.5 percent.
CONCLUSIONS
Seven principal coal beds occur within the Bowman-Gascoyne area.
The most continuous and thickest bed is the Hartnon bed, which is cur
rently being mined near Gascoyne. The thickness of the bed, large
areas under less than 150 ft of overburden, and nearness to transporta
tion routes make the Harmon bed particularly attractive for future coal
development.
REFERENCES
Brant, R. A., 1953, Lignite resources of North Dakota: U.S. Geological Survey Circular 226, 78 p.
Croft, M. G., 1974, Ground-water basic data for Adams and BowmanCounties, North Dakota: North Dakota Geological Survey Bulletin 65, pt. 2, 294 p.
Darton, N. H., 1896, Preliminary report on artesian waters of a portion of the Dakotas: U.S. Geological Survey Annual Report 17, pt. 2, p. 603-694.
Hares, C. J., 1928, Geology and lignite resources of the Marmarth field, southwestern North Dakota: U.S. Geological Survey Bulletin 775, 110 p.
Jacob, A. F., 1973, Depositional environments of Paleocene Tongue River Formation, western North Dakota: American Association of Petroleum Geologists Bulletin, v. 57, no. 6, p. 1038-1052.
Kepferle, R. C. , and Culbertson, W. C., 1955, Strippable lignite deposits, Slope and Bowman Counties, North Dakota: U.S. Geological Survey Bulletin 1015-E, p. 123-182.
Leonard, A. G. , Babcock, E. J., and Dove, L. P., 1925, Lignite deposits of North Dakota: North Dakota Geological Survey Bulletin 4, 240 p.
Lewis, R. C., 1977, Preliminary report on the geology of the Harmon andHansen lignite beds in the southern half of the Bowman-Gascoyne area, Slope, Bowman, and Adams Counties, North Dakota: U.S. Geological Survey Open-File Report 77-377, 4 p., 5 pis., 1 table.
Magnusson, A. M., 1960, North Dakota lignite analyses: University ofNorth Dakota, Division of Mines and Mining Experiments, Bulletin 14, 44 p.
Moore, G. W., Melin, R. E., Kepferle, R. C,, 1956, Preliminary geologic map of the Chalky Buttes area, Slope County, North Dakota: U.S. Geological Survey Coal Investigations Map C-38.
Royse, C. F., Jr., 1967, Tongue River-Sentinel Butte contact in west ern North Dakota: North Dakota Geological Survey Report of In vestigations no. 45, 53 p.
U.S. Geological Survey and North Dakota Geological Survey, 1976,Preliminary report on 1975 drilling of lignites in western North Dakota: Adams, Bowman, Dunn, Hettinger, McLean, Mercer, Oliver, Slope, and Williams Counties: U.S. Geological Survey Open-File Report 76-869, 144 p. (1977).
_____ 1978, Lignite drilling during 1977 in western North Dakota:Adams, Billings. Bowman, Dunn, Golden Valley, Grant, Hettinger, Mercer, Oliver, Slope, Stark, and Williams Counties: U.S. Geolog ical Survey Open-File Report 78-888, 418 p.
Table 2. Drill-hole data for the Bowman-Gascoyne area, unknown]
Explanation
Sources of drill-hole data:
USGS
O.W.
NDSWC
Baukol-Noonan
W.W.
United States Geological Survey
Oil-well geophysical log
North Dakota State Water Commission
Baukol-Noonan, Inc.
Water-well lithologic log
Abbreviation of coal bed names; beds, are listed in descending stratigraphic order:
Fb Fryburg
HT HT Butte
Mr Meyer
GC Garner Creek
Lo A local bed
Hr Harraon
Hn Hansen
, T . Surface Hole Location M Source XT TT elevation No* Sec. -T.N.-R,W. ,_ x
(feet)
1 USGS 34-132-98 2820
Total Rock-coal depth thickness (feet) (feet)
300 128 R 2 C
39 R 2 C
49 R 10 C 51 R 2 C 6 R 2 C
Bed name
GC
Lo
Hr
Hn 2
10
Table 2. Drill-hole data for the Bowman-Gascoyne area -continued
T1 , T Surface Total Rock- coal Hole _ Location .. , .
Source _ _ _ TT elevation depth thickness No. Sec.-T.N.-R.W. ,.. .v , c » fc ,
(feet) (feet) (feet)
2 USGS 14-132-99 2830 346 54 R7 C
57 R3 C
55 R3 C
57 R9 C3 R4 C
56 R2 C
10 R5 C
3 USGS 8-132-101 2997 200 23 R5 C
27 R4 C
34 R18 C33 R7 C7 R2 C
4 USGS 22-132-101 2915 180 22 R3 C
33 R5 C
5 USGS 26-132-101 3007 200 9 R5 C
59 R10 C
6 USGS 8-132-102 2957 100 72 R2 C
13 R3 C
7 USGS 12-132-102 3070 200 31 R4 C
74 R10 C47 R25 C
Bed name
Mr
GC
Lo
Hr!
Hr 2
Hni
Hn 2
GC
Lo
Hr
Hni
Hn 2
Lo
Hr
Lo
Hr
Hni
Hn 2
GC
Lo
Hr
11
Table 2. Drill-hole data for the Bowman-Gascoyne area - continued
Hole No.
8
10
Surface Total Rock-CoalSource _ ° C^, ^Un Tr elevation depth thickness
Sec.-I.N.-R.W. (feet) (feet) (feet)
USGS 14-133-98 2760 520 20 R2 C
10 R2 C
61 R5 C9 R3 C
123 R1 C
14 R2 C
16 R1 C7 R3 C
34 R3 C
13 R3 C
USGS 30-133-98 2734 400 80 R3 C
28 R3 C
51 R3 C
88 R4 C
14 R3 C
59 R2 C5 R2 C
USGS 6-133-100 3112 460 108 R6 C
25 R5 C
116 R2 C
18 R2 C
132 R2 C
Bed name
HTi
HT2
Mrj
Mr 2
Loi
Lo 2
Lo 3
Lott
Hri
Hr 2
GCi
GC 2
Lo
Hr l
Hr 2
Hri!
Hn 2
HT
Mr
GCi
GC 2
Hr
12
Table 2. Drill-hole data for the Bowman-Gascoyne area - continued
Surface Total Rock-coal Hole Location .. ^, , . ,_, . , Source _ ,_ M _ TI elevation depth thickness No. Sec.-l .N.-R.W. ,.. , , f r , ,_ N (feet) (feet) (feet)
11 USGS 14-133-100 2938 460 1004
593
204
983
783
12 USGS 30-133-100 2.884 220 865
798
13 USGS 4-133-101 2965 200 84
13520
14 USGS 14-133-101 2945 220 120175910
15 USGS 18-133-101 2975 260 8226247
16 USGS 24-133-101 2916 280 11524
135215
17 USGS 14-133-102 2881 120 228
18 USGS 22-133-102 2921 120 18473
RCRCRCRCRC
RCRC
RCRC
RCRC
RCRC
RCRCRC
RC
RCRC
Bed name
HT
Mr
GC
Lo
Hr
Lo
Hr
GC
Hr
Hr
Hn
Hr
Hn
Hr
Hn
Hn
En i
Hnz
13
Table 2. Drill-hole data for the Bowman-Gascoyne area - continued
_ » *J i_i 1. i, cH C- AL/l-cl-l-J-»-w* iv^.wa.-i.Hole _ Location .. , .
Source T IT elevation depth thickness No. Sec. -I .N.-R.W. ,,. * , f r . ^foot-^ (feet) (feet) (teet)
19 USGS 24-133-102 2906 120 3211
20 USGS 14-134-99 2791 660 243
1882
9710524
21 USGS 4-134-101 2818 220 8546
31745
22 USGS 8-134-101 2870 240 14438401
23 USGS 32-134-101 2939 200 125
832347882
24 USGS 12-134-102 2941 300 116267
1251223
25 USGS 26-134-102 2886 200 55+
6210484
141
RC
RCRCRCRC
RCRCRC
RCRC
RCRCRCRC
RCRCRCRC
RCRCRCRC
Bed name
Hn
Mr
Lo
Hr
Hn
Hr l
Hr2
Hn
Hr
Hnj
GC
Hr
Hni
Hn 2
Hri
Hr2
Hni
Hn 2
Hr a
Hr2
En l
Hn2
Table 2 . Drill-hole cl a t a for _the_Bowman-G_as coyne area - continued
Hole No.
26
LocationSurface Total Rock-coal
USGS
27 USGS
28 USGS
29 USGS
30 USGS
31 USGS
,, , Bed
(feet) (feet) (fe
134-103 3043 240 628
346
682
255
1-134-103 3048 200 323+
286
613
223
-134-103 3122 180 4420444
442
134-104 3100 180 568
916
^-135-98 2771 540 1774
762
1014
7813
t-135-99 2850 500 565
3194
7914153+
;et;
RCRCRCRC
RCRCRCRC
RCRCRC
RCRC
RCRCRCRC
RCRCRCRC
11*1
Hr 2
Hn
Hrj
Hr 2
Hn
Hr
Hn
GC
Hr
. Mr
GC
Lo
Hr
Fb
Lo
Hr
Hn
15
Table 2. Drill-hole data for the Bowman-Gas coyne area - continued
TT - T . Surface Total Rock-coal Hole Location -, . , . . . , vr^ Source _ m .. _ .. elevation depth thickness wo * Sec.-l .N.-R.W. , c , ,,. . N ( ,. v
(feet) (feet) (feet)
32 USGS 14-135-100 2785 500 287
983
673
135
1386
2325632
145+
33 USGS 30-135-100 2939 520 100225
702
28242
252
1302
22247025
RCRCRCRCRCRCRCRC
RCRCRCRCRCRCRCRCRCR
Bed name
HT
Mr
GCi
GC 2
Lo
Hr
Hn!
Hn 2
Mri
Mr 2
GCi
GC 2
GC 3
GCi|
Lo
Hr
Hn!
34 USGS 12-135-102 2767 500 82 R6 C
57 R3 C9 R10 C30 R 4 C
R25
22
5
Hn 2
Lo
Hrl
Hr2
Hnl
Hn.
16
Table 2.-'"Drill-hole data_ for the Bowman-Gascoyne area -continued
Hole No. Source
35 USGS
36 USGS
37 USGS
38 USGS
39 USGS
40 USGS
Locationc. -T.N.-R.W.
18-135-101
28-135-101
8-135-102
4-135-103
7-135-103
20-135-103
Surface Total Rock-coal elevation depth thickness (feet) (feet) (feet)
2835 340 129 R7 C
66 R18 C64 R6 C
18 R5 C
2874 360 136 R2 C
52 R28 C57 R5 C
29 R2 C
2720 180 9 R4 C
26 R9 C3 R
14 C
2770 160 69 R20 C35 R5 C
2880 240 60 R4 C
18 R2 C
52 R21 C47 R8 C
2950 240 58 R6 C
53 R4 C
30 R11 C4 R4 C
55 R3 C
Bed name
Lo
Hr
Hn
Lo
Hr
Hn
Lo
Hr x
Hr2
Hr
Hn
GC
Lo
Hr
Hn
GC
Lo
Hrl
Hr2
Hn
17
Table 2. Drill-hole data for the Bowman-Gascoyne area - continued
Hole No.
41
42
43
44
45
46
T , Surface Total Rock- coal Location , , , , . ,
Source rp M _ elevation depth thickness Sec.-f .N.-R.W. (e N , ' .>. ,,- N
(feet) (feet) ^feet)
USGS 28-135-103 2854 160 22 R10 C3 R2 C
62 R4 C
USGS 3-135-104 2775 400 10 R10 C30 R7 C
USGS 23-135-104 2853 160 30 R7 C
60 R4 C
USGS 25-135-104 2930 160 22 R8 C
83 R4 C
USGS 20-136-100 2830 660 41 R4 C
60 R7 C
90 R9 C
125 R12 C 3 R5 C
58 R1 C
60 R13 C62 R15 C
USGS 21-136-101 2750 460 52 R8 C
24 R4 C
168 R12 C10 R6 C
16 R2 C9 R4 C
Bed name
Hrj_
Hr2
Hn
Hr
Hn
Hr
Hn
Hr
Hn
Fb
HT
Mr
GCi
GC2
Lo
Hr
Hn
GCi
GC 2
Hri
Hr2
Hni
Hn218
Table 2. Drill-hole data for the Bowman-Gascoyne area - continued
Hole No.
47
48
49
50
51
52
53
54
55
Surface Total Rock-coal Location - , . .
Source _ .. _ TT elevation depth thickness Sec.-T.N.-R.W. /r v ,' , , .
(feet) (feet) (feet)
USGS 13-136-102 2589 160 70 R7 C3 R9 C
24 R3 C
10 R6 C
USGS 20-136-102 2700 470 141 R25 C8 R9 C
Not drilled
USGS 31-136-102 2710 200 56 R22 C28 R2 C
USGS 8-136-103 2876 500 217 R5 C
29 R6 C
32 R3 C
27 R3 C
USGS 22-136-103 2680 160 46 R24 C
USGS 3-136-105 2804 260 21 R5 C
66 R4 C
USGS 11-136-104 2690 200 26 R6 C
65 R2 C
USGS 26-136-104 2874 240 112 R2 C
54 R6 C
14 R10 C
Bed name
Hrj
Hr 2
En i
Hn 2
Hr
Hn
Hr
Hn
Lo
Hr
-Hn
Hr
Hr
Hn
Hr
Hn
Lo
Hr
Hn
19
Table
Hole No.
56
57
2. Drill-hole data for the Bowman-Gascoyne
Surface Location ..
Source elevation Sec, -1 .N. -R. W. , ,. ,
(feet)
USGS 26-136-105 2730
USGS 34-137-101 2560
area -
Total depth (feet)
160
500
continued
Rock-coal thickness
(feet)
42 R2 C
20 R8 C
42 R8 C8 R
10 C 51 R5 C
Bed name
Hn
Hr l
Hr 2
Hn
58 USGS 2-137-102 2580 600
59 USGS 24-137-102 2498 200
60 USGS 28-137-102 2668 600
61
62
USGS
USGS
2-137-103 2445
23-137-103 2760
440
260
264
149824
152586
40
1354
216
972
12514266
492
372
RCRCRCRCRC
bakedrock
RC
RCRCRCRCRCRC
GC
Hri
Hr 2
Hr
Mr
GC
Hr
Hn
No coal inTongue River Member
20
128 R4 C
32 R4 C
49 R7 C
11 R1 C
GC
Lo
Hr
Hn
Table 2. Drill-hole data for the Bowman-Gas coyne area - continued
Surface Total Rock -coal Hole _ Location , , , . Source _ , XT _ tr elevation depth thickness No. Sec.-T.N.-R.W. ,. . , ' , t .
(feet) (feet) (feet)
63 USGS 31-137-103 2750 260 342
324
579
64 USGS 20-137-104 2782 200 382
193
806
65 USGS 26-137-104 2750 500 344
365
567
66 USGS 4-137-105 2798 200 335
402
67 USGS 12-137-105 2773 420 217
262
68 USGS 15-138-100 2749 760 6012
1367
294
1082
442
293
1913+
RCRCRC
RCRCRC
RCRCRC
RCRC
RCRC
RCRCRCRCRCRCRC
Bed name
Lo
Hr
Hn
Lo
Hr
Hn
Lo
Hr
Hn
Lo
Hr
Lo
Hr
Fb
HT L
HT 2
Mr
GCi
GC2
Hr
21
Table 2. Drill-hole data for the Bowman-Gascoyne area - continued
Hole No. Source
Location Sec.-T.N.-R.W
69 uses 23-138-101
70 USGS 4-138-102
71 USGS 22-138-102
72 USGS 12-138-103
73 USGS 30-138-103
74 USGS 8-138-104
Surface Total Rock-coal elevation depth thickness (feet) (feet) (feet)
2662 520 78 R9 C
168 R6 C
190 R3 C8 R2 C
2620 400 132 R4 C
84 R2 C
124 R16 C
2570 300 97 R7 C
138 R8 C
2515 240 145 R8 C
57 R2 C
2800 600 172 R2 C
10 R4 C
46 R2 C
58 R7 C
27 R2 C
2738 500 37 R4 C
17 R4 C
132 R8 C
64 R6 C
Bed name
HT
GC
Hr l
Hr 2
GC
Lo
Hr
GC
Hr
Hr
Hn
GCi
GC 2
Lo
Hr
Hn
GCi
GC 2
Hr
Hn
22
Table 2. Drill-hole data for the Bovman-Gascoyne area - continued
Hole No.
75
76
77
78
79
80
81
Surface Total Rock-coal Location - . , , , . .
Source , , r , elevation depth thickness Sec.-l .N.-R.W. , f , ff x ,_ N
(feet) (feet) (feet)
USGS 10-132-101 2986 220 20 R6 C
40 R4 C
64 R5 C
61 R11 C
USGS 20-132-101 3085 200 104 R6 C
49 R18 C
USGS 26-133-101 2976 200 42 R6 C
79 R3 C
36 R17 C
USGS 26-133-101 2905 220 54 R3 C
46 R3 C
27 R12 C41 R12 C
USGS 30-133-101 2995 200 43 R9 C
59 R27 C26 R11 C
USGS 32-133-101 2997 200 79 R27 C30 R10 C
USGS 34-133-101 2995 200 29 R3 C
50 R8 C
74 R26 C
Bed name
Mr
GC
Lo
Hr
Lo
Hr
GC
Lo
Hr
GC
Lo
Hr
Hn
GC
Hr
Hn
Hr
Hn
Mr
GC
Hr
23
Table 2. Drill-hole data for the Bowman-Gascoyne area - continued
Hole No. Source
82 USGS
83 USGS
84 USGS
85 USGS
86 USGS
87 USGS
USGS
Location Sec.-T.N.-R.W.
4-134-101
8-134-101
18-134-101
6-134-101
8-135-101
20-135-101
30-135-101
Surface Total Rock- coal elevation depth thickness (feet) (feet) (feet)
2850 280 1544
152760262
2848 492 1313655
174
2850 240 8336472
223
2898 300 129214
15666
2832 300 1656
4515
2835 260 15628664
2761 160 3475
16776
RCRCRCRC
RCRCRC
RCRCRC
RCRCRC
RCRC
RCRC
RCRCRC
Bed name
Hri
Hr 2
En i
Hn 2
Hr
' Hn }
Hn 2
Hr
En i
En 2
Hri
Hr 2
Hn
Lo
Hr
Hr
Hn
Hri
Hr 2
Hn
24
Table 2, Drill-hole data for the Bowman-Gascoyne area - continued
Hole No.
89
90
Surface Total Location _ . it
S°urce Sec.-T.N.-R.W. Ration ^epth (feet) (feet)
USGS 30-135-101 2760 160
USGS 32-135-101 2805 200
Rock-coal thickness
(feet)
28 R 4 C 5 R
29 C 74 R 5 C
73 R 4 C 2 R
28 C 64 R 5 C
Bed name
Hri
Hr 2
Hn
Hr 2
Hn
91
92
O.W.
O.W
93 O.W
94 O.W
1-138-102 2630 8150 200 no record202 R
8 C Hr
10-138-102 2517 9300 44 R4 C GCi
12 R6 C GC2
221 R11 C Hr
9-137-100 2914 8275 608 no record35 R12 C Hr70 R7 C Hn
15-137-100 2841 9375 577 no record10 R11 C Hr76 R8 C Hn
95 O.W. 22-137-100 2843 8250
25
53 R5 C
45 R10 C69 R5 C
45 R9 C
104 R11 C52 R4 C
166 R12 C84 R15 C
Fb
HT
Mr
GC
Lo
Hr
Hn
Table 2. Drill-hole data for the Bowman-Gascoyne area - continued
Surface Total Rock-coal Hole Location , , , tl_ . . . XT Source _ XT _ TT elevation depth thickness No. Sec.-l .N.-R.W. ,. , ff ,. , .
(feet) (feet) (feet)
96 O.W. 1-136-100 2724 8015 110 R7 C
26 R8 C
97 R11 C89 R5 C
163 R16 C21 R12 C
97 O.W. 2-136-100 2757 8050 95 R4 C
63 R6 C
25 R8 C
126 R9 C
83 R5 C
148 R14 C20 R13 C
98 O.W. 2-136-100 2780 8105 139 no8 R7 C
61 R8 C
32 R6 C
118 R12 C52 R6 C
159 R16 C15 R14 C
Bed name
HT
Mr
GC
Lo
Hr
Hn
Fb
HT
Mr
GC
Lo
Hr
Hn
record
Fb
HT
Mr
GC
Lo
Hr
Hn
26
Table 2. Drill-hole data for the Bowman-Gascoyne area - continued
TT , T Surface Total Rock-coal Hole _ Location . . . .
Source XT _ TI elevation depth thickness No. Sec.-T .N.-R.W. fe , , r , f .
(feet) (feet) (feet)
99 NDSWC 31-136-100 2850 1705 75 R11 C74 R4 C
168 R12 C6 R4 C8 R2 C
72 R16 C64 R5 C9 R6 C
100 O.W. 23-136-101 2792 11,510 142 no70 R5 C
87 R10 C78 R4 C8 R5 C
101 O.W. 2-135-98 2643 8480 198 no77 R3 C
85 R13 C
102 Baukol-Noonan 4-135-99 2740 240 29 R5 C
48 R7 C
65 R8 C
Bed name
Fb
HT
GCi
GC 2
GC 3
Hr
Hni
Hn 2
record
Lo
Hr
Hn }
Hn 2
record
Lo
Hr
Fb
HT
Mr
27
Table 2. Drill-hole data for the Bowman-Gascoyne area - continued
Hole Location 1 ^ , , . ,_, , . Source _, XT rT elevation depth thickness No. Sec.-l .N.-R.W. , c » , c * fc * (feet) (feet) (feet)
103 USGS 4-135-99 2757 618 133
33563
1015
533
18236
675
10816583
107
104 Baukol-Noonan 13-135-99 Insufficient data
105 NDSWC 4-134-101 2905 Unk 19143
15+
106 NDSWC 17-134-101 2900 180 129204
11
107 O.W. 24-134-104 3100 1300 4512276
RCRCRCRCRCRCRCRCRCRCRC
RCRC
RCRC
RCRC
Bed name.
Fb
HTj
HT 2
Mr
GCi
GC 2
GC 3
Lo
Hr
Hni
Hn2
Hri
Hr2
Hri
Hr2
Hr
Hn
28
Table 2. Drill-hole data for the Bowman-Gascoyne area - continued
Hole ^ Location No. ' ource Sec .-T.N.-R.W.
108 USGS 24-134-98
109 USGS 30-134-99
110 O.W. 5-133-98
111 Baukol-Noonan 7-133-98
112 Baukol-Noonan 17-133-98
113 O.W. 32-133-101
114 NDSWC 14-132-100
115 O.W. 12-132-101
Surface Total Rock- coal elevation depth thickness (feet) (feet) (feet)
2760 500 29 3
2253
91375
1062
2880 500 22 3 34
28715673
2769 10.760 41 6 53
3157
538
2740 Unk 25 15.5
2755 140 29 13.5
2961 5410 69 26339
2820 60 51 9
2819 450 72 5
407
R CRCRCRC RC
R C RC RCRC
R C RC RCRC
C
R C
R CRC
R C
R CRC
Bed name
Mr
GC
Hr l
Hr2
Hn
Mrj
Mr2
Hr
Hn
Mrj
Mr2
Hr
Hn
Mr
Mr
Hr
Hn
Lo
Hr
Hn
29
Table 2. Drill-hole data for the Bowman-Gascoyne area - continued
116
117
119
120
121
122
123
124
Surface Total Rock-coal fi ,, > o u r c e
NDSWC
NDSWC
NDSWC
NDSWC
NDSWC
NDSWC
W.W.
USGS
USGS
Occ * ' l ' (feet) (feet) (ieet)
12-132-101 2886 600 81 R6 C
31 R7 C
10-132-101 2825 360 75 R5 C
24-132-102 3040 580 86 R30 C
18-132-102 2959 126 43 R5 C4 R8 C
1-131-98 2761 190 126 R6 C
7-131-98 2959 387 46 R6 C
150 R3 C
46 R13 C
6 R3 C
33 R2 C
36-132-101 2936 450 30 no38 R
3 C
8-131-99 2915 500 242 R10 C
5 R4 C
11 R5 C
17-131-99 2845 180 134 R13 C
8 R6 C
>bnarne
Hr
Hn
Hr
Ilr
Hri-,
Hn2
Hr
Mr
Lo
Hrj
Hr2
Hn
record
Hn
Hr l
Hr 2
Hn
Hri
Hr?
30
Table 2. Drill-hole data for the Bowman-Gascoyne area - continued
Hole No.
125
126
127
128
129
130
131
132
133
134
Source
uses
NDSWC
NDSWC
NDSWC
NDSWC
NDSWC
NDSWC
NDSWC
NDSWC
NDSWC
Location Sec.-T.N.-R.W.
19-131-99
19-131-99
20-131-99
21-131-99
21-131-99
22-131-99
23-131-99
25-131-99
24-131-99
26-131-99
Surface elevation (feet)
2840
2790
2770
2810
2827
2788
2809
2846
2970
2830
Total Rock-coal depth thickness (feet) (feet)
160 112 R 21 C5 R9 C
80 25 R 20 C7 R
10 C
140 15 R20 C5 R
12 C
200 70 R18 C 7 R
10 C
242 128 R8 C9 R3 C
180 81 R 8 C3 R
17 C
200 64 R7 C3 R
12 C
460 127 R 6 C5 R
13 C
262 210 R 12 C
127 99 R7 C4 R
10 C
Bed name
Hr2
Hri
Hr2
Hri
Hr2
Hri
Hr2
Hri
Hr2
Hn
Hr2
Hri
Hr2
Hri
Hr 2
Lo
Hri
Hr2
31
Table 2. Drill-hole data for the Bowman-Gascoyne area - continued
HoleNo.
135
136
137
138
139
140
141
142
143
144
145
Location Source ..
S e c . - 1 . N . -R . w .
NDSWC 26-131-99
USGS 35-131-99
USGS 26-131-99
USGS 26-131-99
USGS 28-131-99
USGS 28-131-99
NDSWC 29-131-99
USGS 28 _ 1 3 1 _99
NDSWC 33-131-99
NDSWC 34-131-99
NDSWC 35-131-99
elevation depth thickness (feet) (feet) (feet)
2815 78 45 R9 C5 R
10 C
2785 Unk 37 R8 C4 R
15 C
2791 Unk 60 R9 C5 R
18 C
2782 Unk 31 R10 C3 R
20 C
2789 Unk 48 R8 C4 R
20 C
2815 Unk 45 R9 C1 R
23 C
2794 142 47 R 22 c4 R8 C
2804 Unk 46 R31 C
2780 153 34 R10 C4 R
19 C
No record
2760 Unk 16 R9 C
Bed name
Hr l
Hr2
Hri
Hr 2
Hri
Hr 2
Hri
Hr2
Hri
Hr2
Hri
Hr2
Hri
Hr2
Hr
Hri
Hr2
Hri
32
Tab 1 e 2. Drill-hole data for the Bowman-Gascoyne area «- continued
Hole , T Source- No.
146 USGS
]47 NDSWC
148 NDSWC
149 USGS
150 USGS
151 USGS
152 NDSWC
153 USGS
154 USGS
155 USGS
156 NDSWC
Location Sec.-T.N.-R.W.
28-131-99
36-131-99
1-130-99
36-131-99
36-131-99
36-131-99
4-130-98
12-130-98
10-131-100
11-131-100
9-131-100
our race elevation (feet)
2770
2788
2768
2780
2805
2795
2840
2875
2840
2802
2845
i u tax depth (feet)
Unk
Unk
Unk
Unk
Unk
Unk
95
500
160
Unk
1068
txuctv cuu i thickness
(feet)
9 R5 C
12 R20 C
27 R9 C
19 R9 C
22 R11 C
48 R7 C
30 R8 C
69 R9 C7 R9 C
73 R5 C8 R4 C
33 R3 C
13 R4 C
61 R3 C
28 R9 C
32 R5 C3 R8 C7 R3 C
67 R5 C
Bed name
Hr i
Hr?
Hf!
lit-!
Hi'!
Hr l
Hri
Hri
Ur2
Hri
II r 2
HiTi
Hr2
Hn
Hri
Hri
Hr2
Hn
33
Table 2. Drill-hole data for the Bowman-Gascoyne area - continued
Hole No.
157
158
159
160
161
162
163
164
165
166
167
Location Source Sec.-T.N.-R.W.
NDSWC 29-131-100
NDSWC 23-131-100
W.W. 24-131-100
USGS 25-131-100
NDSWC 2-130-100
NDSWC 2-130-100
NDSWC 24-130-100 -
NDSWC 19-130-99
NDSWC 23-130-99
USGS 20-132-100
USGS 20-133-100
OUIlclUti JLUCclJL 1\UU£V i_Uci i
elevation depth thickness (feet) (feet) (feet)
2856 193 75 R5 C
12 R1 C
2780 124 40 R19 C11 R
6 C
2770 Ur.k 13 R15 C14 R12 C
2787 Unk 8 R19+ C
2828 103 38 R4 C
2805 107 23 R8 C
48 R2 C
2820 270 51 R4 C2 R5 C
Insufficient data
2770 412 9 R10 C
2845 500 35 R3 C9 R3 C
2944 500 30 R3 C3 R3 C
225 R11 C37 R
2 C
Bedn ame
Hr 1
Hr2
Hr l
Hr2
Hr l
Hr2
Hr
Hr
Hr
Hn
Hri
Hr2
Hri
Hr?
Mri
Mr2
Hr
Hn
34
Table 2. Drill-hole data for the Bowman-Gascoyne area - continued
,, , . Surface Total Rock- coal Hole 0 Location i ...t i fc i_ ^* i Source _ . T _ TT elevation depth thickness No. bee. -I .N .-R.W. x- * .-- ^ x , .
(feet) (feet) (feet)
168 USCS 28-138-105 2822 603 74 R6 C
102 R7 C
Bed name
Hr
Hn
169 USGS 6-138-105 2925 236 198 no record
35
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